Tool holder



Aprilzz, 1930. Y' G. C, PEARSON 1,755,269

rIOOL HOLDERv .Filed Aprm 19, 1928 2 sheets-sheet 2 CefJofo.

Patented pr. 272V-, 1930 Umfang@*staresfil GUSTAV cirnnason,v orynnnvnn,COLORADQQ'SSGQB, T Gannnnnfpnnvnneoiyi A PANY, or DENVER, COLORADO, Aeoaroaarron oil-DELAWARE i Toor. nonnina@ 'l Y. Application led April19,

The present invention relates to tool re-` tainers for rook drills andthetlike, the objeetbeing to provide a novel and simplek structure inwhich the .means for holding the retainer in its operative position andin its inoperative position-is simple, is very completely housed andadds practically nothing to the size of the structure'beyond that of theretainer y'mechanism proper.`

In the accompanying drawings:

- Figure 1 is a front elevation ofthe preferredrembodiment lof theinvention. v

Figure 2 is asectional view on" the line 2-2 of Figure 1, and showingthe tool retainer in its operative position.

Figure 3 is a view taken on the same plane vas Figure -1,but showing theretainer in itsl inoperative position.

Figure 4 is a `view in elevation of therock shaft'with theplungertherein.L

FigureV 5 is a detail perspective' view of said plunger. f n' Y Y v Y' yIn the embodiment disclosed, Vthe holder for the tool is designatedgenerally by the reference numeral 6 and is designed tok receive a steel7 havinga eollar 8. The holder iny cludes a housing 9 having altransverse en` largement 10 at its front end provided with a bore 11.vIn this bore kis journaled, a rock shaft 12 having its ends'p'rojectingbeyond Vthe enlargementlOand provided with' trans I stop lugs 9 V(Therock shaft 12 verse openings 13. A tool-retaining yoke lei is providedwith-S-shaped side arms 15, the ends of which passv through the openingsv13 of the shaft 12, andare pinned therein as indicated at 16. Theportionsof the side .arms above the shaft 12 are adaptedr to abutagainst 17V formed upon the'opposite sides of the housing 9. v v

is provided Vcentrally with a transverse socket 18 opening through f oneside and in said socket is a reciprocatory vplunger 19 chambered toreceive a coiled spring 20 located in said socket and bearing againstthe bottom thereof and against 'the plunger to urge the same outwardly.A toggle link 21 is interposed between the plunger 19 and the adjacentwall of the bore11, said toggle link being provided with curved heads192s. senat-No. arrasar' 22lovcated insockets-23 formed inn the plunger.i

1'9.and wall of the bore.

yThe arrangement is such that vwhen the'A yoke is in its operativeposition, as shown-in Figure 2, with its front portion in the path V'ofthe collar 8 Vof the drill steel 7, the toggle link .2l is in a positionto' cause the spring tocurge said shaft in al directionto hold the yokein saidoperative position.` To move the yoke to its inoperativeposition, itis only necessary 4to` swing Ythe .samey rearwardly, therebyturning the rock shaft until the tog'- gle link 21 has moved pastitsdead center,

whereupon thespring willrreact andk hold said yoke in the'position shownin Figure 3. l i

From the foregoing, it is'v thought that the construction, operation andmany advantages of the herein described invention will be ap-` parent tothose skilled inthe art,rwithout' further desoriptiomand it will beunderstood.

that various changes in the size, shape, prOfportion andvminor detailsof construction may be resorted kto withoutfdeparting from the spirit orsacrificing any of the advantages f, of the invention; n

lVhat I claim, is:

plungerand against a fixed portion ,ofl theV tool holder.

2.l The combination with a tool'holder,ioff a tool -retainer comprisinga rock shaft jourfA naled on the tool holder and a yoke having l. Thecombination with a tool holder, of K sidearms connected to therockshaft`,ja yield- ,l

Ving plunger mounted in the rockshaft, anda toggle link having a bearingagainst the f plunger andragainst Aa portion of the tool holder. Y

3. The combination with4 atool holder. in-w oluding ahousing having atransversel bore, of a rock shaft j'ournaled in the bore and pro-V.jeeting fromthe opposite ends thereof, said 3 shaft having a `transversesocket between its ends-and within' thebore, a retaining yoke havinglside armsmounted in the projecting ends of the shaft, a spring pressedplungerin the socket of the shaft, and aftoggle. link g lili.

bearing against the plunger and against the adjacent Wall of the bore.

4. The combination With a tool holder ineluding a housing having atransverse loore7 of a rock shaft jouinaled in the bore, a swinging toolretainer l'iXed' to the rock shaft and causing it to turn, said rockshaft having a transverse socket Within the loore7 a spring pressedplunger mounted t in the rock shaft, and a toggle link that extends intothe Vsocket and bears against the 'plunger and against the' Wall of thebore, said toggle link having a swinging movement inthe shaft socket.

In testimony whereof, I affix mysignat-ure.

vGrUSTAV O. PEARSON..

